<template>
  <div>
    <h2 v-if="firstView">输入用户名搜索</h2>
    <h2 v-if="loading">loading</h2>
    <h2 v-if="errorMsg">{{errorMsg}}</h2>
    <div class="row">
      <div class="card" v-for="(user, index) in users" :key="index">
        <a :href="user.url" target="_blank">
          <img :src="user.avatar_url" style='width: 100px'/>
        </a>
        <p class="card-text">{{user.name}}</p>
      </div>
    </div>
  </div>
</template>

<script>
  import PubSub from 'pubsub-js'
  import axios from 'axios'

  export default {
    data () {
      return {
        firstView: true,
        loading: false,
        users: null, //[{url:'',avatar_url:'',name:''}]
        errorMsg: ''
      }
    },

    mounted() {
      //是否在此发ajax请求，不是，而是在点击search之后
      //订阅搜索的消息
      PubSub.subscribe('search', (msg, searchName) => {//说明需要发ajax请求进行搜索
      const url = `https://api.github.com/search/users?q=${searchName}`

      //更新状态(请求中)
      this.firstView = false
      this.loading = true
      this.users = null
      this.errorMsg = ''

      //发ajax请求
      axios.get(url).then(response => {
        const result = response.data
        const users = result.items.map(item => ({
          url: item.html_url,
          avatar_url: item.avatar_url,
          name: item.login
        }))
        //成功,更新状态(成功)
        this.loading = false
        this.users = users
      }).catch(error => {
        //失败,更新状态(失败)
        this.firstView = false
        this.errorMsg = '请求失败'
      })

      })
    }
  }
</script>

<style scoped>
  .card {
    float: left;
    width: 33.333%;
    padding: .75rem;
    margin-bottom: 2rem;
    border: 1px solid #efefef;
    text-align: center;
  }

  .card > img {
    margin-bottom: .75rem;
    border-radius: 100px;
  }

  .card-text {
    font-size: 85%;
  }
</style>
